<template>
	<!-- 分类页 -->
  <view>
	  <!-- 使用自定义的搜索组件 -->
	  <!-- <my-search :bgcolor="'pink'" :radius="3"></my-search> -->
	  <my-search @click="gotoSearch"></my-search>
	  
    <view class="scroll-view-container">
    	<!-- 左侧的滑动区域 -->
		<scroll-view class="left-scrool-view" scroll-y="true" :style="{height:wh + 'px'}">
			<block v-for="(item,i) in cateList" :key="i">
				<view :class="['left-scrool-view-item', i === active ? 'active' : '']" @click="activeChanged(i)">{{item.cat_name}}</view>
			</block>
		</scroll-view>
		<!-- 右侧的滑动区域 -->
		<scroll-view scroll-y="true" :style="{height:wh + 'px'}" :scroll-top="scroolTop">
			<view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
				<!-- 二级分类的标题 -->
				<view class="cate-lv2-title">/{{item2.cat_name}}/</view>
				<!-- 当前二级分类下的三级列表 -->
				<view class="cate-lv3-list">
					<!-- 三级分类的item项 -->
					<view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
						<!-- 三级分类的图片 -->
						<image :src="item3.cat_icon"></image>
						<!-- 三级分类的文本 -->
						<text>{{item3.cat_name}}</text>
					</view>
				</view>
			</view>
		</scroll-view>
    </view>
  </view>
</template>

<script>
  import badgeMix from '@/mixins/tabbar-badge.js'
  
  export default {
  	  mixins: [badgeMix],
    data() {
      return {
        //当前设备可用的高度
		wh:0,
		cateList:[],
		active:0,
		//二级分类的列表
		cateLevel2:[],
		scroolTop:0
      };
    },
	onLoad() {
		const sysInfo = uni.getSystemInfoSync()
		this.wh = sysInfo.windowHeight - 50
		
		this.getCateList()
	},
	methods:{
		//获取分类列表数据
		async getCateList(){
			const {data:res} = await uni.$http.get('/api/public/v1/categories')
			if(res.meta.status !== 200) return uni.$showMsg()
			this.cateList = res.message
			
			//为二级分类赋值
			this.cateLevel2 = res.message[0].children
		},
		activeChanged(i){
			this.active = i
			
			//重新为二级分类赋值
			this.cateLevel2 = this.cateList[i].children
			
			this.scroolTop = this.scroolTop === 0 ? 1 : 0
		},
		//跳转到商品列表
		gotoGoodsList(item){
			uni.navigateTo({
				url:'/subpkg/goods_list/goods_list?cid=' + item.cat_id
			})
		},
		gotoSearch(){
			uni.navigateTo({
				url:'/subpkg/search/search'
			})
		}
	}
  }
</script>

<style lang="scss">
.scroll-view-container{
	display: flex;
}
.left-scrool-view{
	width: 120px;
}
.left-scrool-view-item{
	background-color: #F7F7F7;line-height: 60px;
	text-align: center;
	font-size: 12px;
	
	&.active {
		background-color: #FFFFFF;
		position: relative;
		
		&::before{
			content: ' ';
			display: block;
			width: 3px;
			height: 30px;
			background-color: #c00000;
			position: absolute;
			top: 50%;
			left: 0;
			transform: translateY(-50%);
		}
	}
}
.cate-lv2-title{
	font-size: 12px;
	font-weight: bold;
	text-align: center;
	padding: 15px 0;
}
.cate-lv3-list{
	display: flex;
	flex-wrap: wrap;
	
	.cate-lv3-item{
		width: 33.33%;
		display: flex;
		flex-direction: column;
		justify-content: center;
		align-items: center;
		margin-bottom: 10px;
		
		image{
			width: 60px;
			height: 60px;
		}
		text{
			font-size: 12px;
		}
	}
}
</style>
